Table 4. Results of univariate ANCOVA fitting the mean of the genetic-based variation among population in MLD damage within trials as the response variable, trial as a fixed factor, an explanatory covariate (latitude, elevation above sea level, mean daily maximum temperature, mean summer rainfall, mean autumn rainfall and predicted MLD risk [based on the Ecoclimatic Index modelled in Pinkard et al., 2010] respectively) and trial by covariate interaction.
| Explanatory covariate | Explanatory covariate effect P-value | Trial × explanatory covariate effect P-value | R2 | Direction of slope |
|---|---|---|---|---|
| Latitude (° South) | <0.0001 | 0.0013 | 0.64 | Positivea |
| Elevation (m) | 0.3864 | 0.6684 | 0.05 | Positive |
| Daily maximum temperature (°C) | <0.0001 | 0.0118 | 0.41 | Negativea |
| Summer rainfall (m) | 0.0418 | 0.1760 | 0.17 | Positive |
| Autumn rainfall (m) | 0.9837 | 0.6681 | 0.04 | Negative |
| Predicted MLD risk (Ecoclimatic Index) | 0.0019 | 0.1678 | 0.24 | Negative |
Abbreviations: ANCOVA, analyses of covariance; MLD, Mycosphaerella leaf disease.
The mean of within-trial population MLD damage was weighted by the trial mean to account for differences in the scale of damage across trials. The direction of the slope of the relationship between the explanatory covariate and the population MLD damage estimated across the five trials is indicated.
a
The direction of the slope was consistent across all five trials.